\begin{tikzpicture}[>=Stealth, scale=0.6]
    \draw [->] (-3, 0) -- (3, 0) node[anchor=north] {$x$};
    \draw [->] (0, -3) -- (0, 3) node[anchor=east] {$y$};
    \draw (0, 0) node [anchor=north east] {\small $O$};

    \filldraw [fill=black] (2, 0) circle (0.05) node [anchor=south] {\small $P$};
\end{tikzpicture}

